Grating structure



eco 17, 1929. N. BERSON 1,740,219

.GRATING STRUCTURE Filed May 26, 1926 Y IIIIIIi/lI/I/IA 1N VENTOR Wai'fiarz Ber-50W ATTORNEYS Patented Dec. 17, 1929 UNITED STATES PATENT OFFICE NATHAN BERSON, OF BROOKLYN, NEW YORK, ASSIGNOR, BY MESNE ASSIGNMENTS, TO

THE TRI-LOK COMPANY, OF PITTSBURGH, PENNSYLVANIA, A. CORPORATION PENNSYLVANIA Application filed May 26,

lhis invention relates to gratings of the type which is particularly adapted for sidewalk openings, such as are used over areaways, subway ventilation openings, or the a like, and the invention has particular reference to gratings which are fabricated from 1 sets of interlocked crossed bars.

Heretofore gratings of this character have been constructed which employ expensive meansor methods for connecting or interlocking the crossed bars, and it is the primary object of the present invention to provide a new and improved means or method of establishing an interlocked connection by the pressure of the crossed bars toward each other, whereby the expense, time and labor entailed are materially reduced while a grating of maximum strength is produced. I

With the above recited and other objects in view, reference is had to the following specification and accompanying drawings in which there is exhibited one example or embodiment of the invention which is .in no way intended as a limitation upon the scope of the appended claim as it is to be clearly understood that variations and modifications which properly fall within the scope of said claims may be resorted to when found expedient.

In the drawings- Figure 1 is a plan View of a section of a grating constructed in accordance with the invention;

Fig. 2 is a sectional view thereof taken approximately on the line 2-2 of Fig. 1;

Fig.3 is a sectional view therethrough taken approximately on the line 3--3 of Fig. 1;

Fig. 4: is a fragmentary perspective view of one of the'crossed elements;

Fig. 5 is a similar View of one of the other crossed elements.

Referring to the drawings by characters of reference, and for the purpose of convenience, 10 represents the longitudinal or bearing elements. and 11 the transverse or sup ported elements which are carried by the longitudinal or hearing elements. The bearing or longitudinal elementslO are of substantially greater width than the transverse ele- GBATING STRUCTURE 1926. $erial No. 111,346.

ments and the same are provided at their up per edges with pairs of receiving notches 12 and 13, the respective notches of each pair diverging downwardly. The transverse or sup ported elements 11 may be of any desired shape, but as shown are of substantially sinuous formation having relatively laterally offset portions 14 joined by angularly disposed portions 15. Each of the offset portions 14 is provided with a vertical notch or slot 16 extending from its lower edge to a point substantially medial of its height or width.

In assembling the elements 10 and 11, the notched portions 16 are engaged with the notches 12 or 13 of the parallel bearing or longitudinal bars 10 and when sufficient pressure is brought to bear to cause the parts of the offset portions 14 to engage in the inclined or angular notches or slots 12 or 13, it is obvious that a lateral twisting or canting of the offset portions is obtained. The arrange ment is such that each alternate oflt'set portion 14 of the transverse elements will engage in a notch or slot 12 or 13Which is oppositely inclined with respect to an adjacent portion so that each alternate offset portion will be oppositely twisted or canted thereby firmly establishing a frictional interlocking connection which positively precludes disengagement and this Without employing any other or auxiliary connecting means.

It is therefore obvious that thesaving of time, labor and expense is effected, as the fabrication of the parts necessitates only an initial juXt-apositioning thereof and the application of sufficient pressure to force the parts in correlated connecting position.

It is furthermore obvious that due to the absence of welding, soldering, riveting or other analogous connecting means, the removal of a broken element may be more readily effected when the occasion demands.

What is claimed is: i

A grating structure comprising spaced "girder bars, each having slots arranged there in in pairs, the slots being substantially straight and being both inclined to the top surface of the girder bars, one slot in a pair being inclined in one direction and the other slot being inclined in the other direction, and

cross bars extending crosswise of the 'rder 7 bars and fitting into the slots, pairs 0 slots in one girder bar being staggered with relation to pairs of slots 1n an adjacent girder bar, the cross bars being bent so as to alter natel engage a slot in one girder bar incline in one direction and a slot in the next girder bar inclined in the other direction.

NATHAN BERSON. 

